Portion of a watch



FIG. 1 is a front right perspective view of a portion of a watch showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof,

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a top view thereof.

The broken line showing of the watch strap is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a portion of a watch, as shown and described. 